Expansion joint



Oct. 29, 1935.

E. E. HALL 'ET Al.

EXPANSION4 JoINT Filed May 19, 1933 2 Sheets-Sheet l C Zjfczl an d' Oct. 29, 1935. E. E. HALL Er AL 2,019,131

EXPANSION JOINT Filed May 19. 19:53 2 sheets-Sheet 2 Patented Oct. 29, 1935 PATENT oFr-jlcs EXPANSION JOINT' Eric E. nail,- cmmo, ma william n. menelmm,

Des Plaines, lll.: said Hall-assignorto said' Eichelman Application May 19, 1933, Serial No. 671,896

9 Claims. (Cl. 94-1-18) Our present invention relatesto improvements in expansion joints for monolithic concrete construction, pre-cast slabs and the like, such vas shown and described in our copending applications relating to this. subject, tiled August 12, 1932, Serial No. 628,576, and which has matured into United States Letters Patent No. 1,958,391 issued May 8th, 1934; and United States Letters Patent No. 1,978,305 patented October 23, 1934 10 which was led February 23,1933, Serial No. 657,978; and May 8, 1933, Serial No. 669,814; and likewise has for its paramount object, the provision of an expansion joint, which when placed vbetween adjacent slabs. will compensate for the relative lateral separating and converging move- -ment of the adjoining slabs and still eiectively join and allow of their independent or relative vertical movement, sealing the joining of the slabs against the possible entrance of foreign matter such as water, ice or dirt.

In the applications above referred to we have .disclosed various means employing both integral and removable seals with metallic supports or stools for effecting an air space below the seal and between the`ends of the adjacent concrete sections, wherein the lateral extensions or anchors of the seal engage the adjoining slabs; the seal itself extends up and between the adjacent faces of the slabs, flexing yto accommodate the moveo ment of the slabs, andis protected with a compressible ller.

It is now our4 objectto provide a joint such as previously described, but wherein the metallic stool itself is likewise provided with a compress-J ible filler which is a separate independent unit serving to create a deiinite spacing apart of the adjoining concrete walls during the pouring of the slabs, and which, as. such, may be compressed and allow of their independent relative converging and separatingmovement.

A further object is `to so position the compressible ller and the metallic stool, that a corelating action between the combination is set up, effecting the desired rigidity and necessary iiexibility required in a joint of this type.

A still further object of our invention is to provide a replaceable cap or seal in combination with the quasi-rigid anchors, with such a stool or support which in itself is braced against collapse;

and further to provide means for transmitting the load from one slab to the next adjacent slab and to limit their relative vertical movement at the joint; to effect a space between the adjacent ends `of the slabs to permit of their uninterrupted space tight against `the entrance of foreign matter.

Having the foregoing objects in mind, and others as will be more specifically pointed out' in the following speciiication and appended claims, 5

we have illustrated a preferred embodiment of our invention in the accompnying drawings, in whichz- Fig. 1 is a transverse section thru the joint prior to its installation; l0'

Fig. 2 is a like view of a modified form of joint;

Fig. 3 is similar to Fig. 1 showing reinforcing means providing against the collapse of the seal during pouring;

Fig. 4 is a likesection thru the joint shown cast l5 in place between ends of adjoining sections of concrete; the joint being intercepted by means of a dowel and dowel socket for limiting the rela.- tive vertical movement between the concrete sections;

Fig. 5 is a fragmentary vertical section of the joint taken on line 5-5 of Fig. 3;

Fig. 6 is a transverse section thru a modified form of joint, showing the adaptability of the presentstool construction to a renewable or re- 25 placeable seal;

Fig. 7 is alike section, showing the joint cast in place between adjoining f sections of concrete.

' The screed has here been removed and the metallic seal placed; and y 30 Fig. 8 is a. transverse section similar to Fig. 1 showing theapplication of the present stool where the hairpin fold or seal is employed at both the top andv bottom or front and rear of the ends of adjoining concrete sections to effect a double.

seal.

Similar reference characters refer to similar parts thruout the respective views.

An expansion joint when placed between the ends of adjoining sections of concrete, monolithic 40 or precast, must effectively compensate for their lateral or linear converging and separating movement.v The joint to be successful must also provide for a limited, relatively vertical movement of the slabs. That is, an appreciable 45 settling of one beyond that of the next adjoining should not destroy the joint or impair the seal to the extent of permitting the entrance of foreign matter. And where a known load is to be carried from one slab to the next, as is the case in road 50 building, provision must also be made for load transmission from one to the other. Therefore, for purposes of description only, we elect to define our invention as applied to road building, because, as such, it will involve a large number of principles, actions, or functions met with in construction work.

As before, the joint comprises two major ele-- ments-a seal, and a stool for supporting the seal prior to the pouring of the concrete. And as before, the seal may comprise a flexible hair pin fold I0, with integral anchors I I, engaging or imbedded in adjacent concrete sections I2, and I3.

Or as an alternate, the seal may be of the replaceable type as shown at Fig. '7, wherein the seal I4, is removably ailixed to the anchors I5, which in turn are imbedded in the concrete sections I1, and I8. In either case, the seal is protected by means 'of a bituminous filler I6, poured over and between the seal and the adjoining concrete sections.

The stool, or temporary support for the seal as above described preferably comprises a metallic side Wall member I 9, made either in sections or in a continuous strip running transversely of the road and the full length of the joint. The member I9, is rolled out at a right angle and back upon itself to form a base 20, at the bottom, and at the top has lateral fins 2|, and 22, punched from the walls in alternate directions. The seal for the joint rests upon these fins or shoulders 2 I and 22, prior to the pouring of the concrete, and is temporarily secured thereto, as the flns are bent back and crimped to the anchors of the seal thru apertures in the anchors as shown. The metal of the wall member I9, is preferably extruded or drawn into corrugations 23, at points between the seal and the base 20, which corrugations are shown running parallel with the base.

Placed adjacent the metallic wall I9, is a strip of compressible filler 24, preefrably constructed from a pre-moulded fibre matrix anclbitumen. A tongue 25, is punched up from the Abase 20, of the metallic wall member, back and against the filler 24, holding same in place at the bottom. The top of the filler is notched at points 2l, along its upper edge so that it may preferably extend up and into the seal of the joint as shown. This arrangement of parts holds the 1111er 24, in place during the shipment and installing of the joint as a whole. The filler, entering the seal, serves the purpose of preventing premature collapse of the seal during the pouringthis feature may be augmented by punching an additional series of clips 21, from the top edge of the wall member I9, which are bent over and impinge against the opposite wall oi the seal (see Figs. 3 and 5).

In operation, the joint comprising a seal with a stool, as described, is placed across the road bed and between the side rails of the road forms. 'I'he adjoining sections of concrete are next poured, the screed or form 40, as shown Figs. l, 2 and 3, and in the modified form as shown at 4I in Fig. 6, removed, and the top,fl1ler poured into the resultant opening. After the concrete has set it is subject to a lateral or linear converging and separating movement due to temperature change. And as the adjoining sections expand, the joint must compress, in which case, the filler 24, is likewise compressed and forced both into the corrugations 23, of the metallic wall I8, and also up .and into the seal of the joint. Flgure 4, of the drawings,

a simple modification of the structures previousLv described; herein the stool is comprised of two strips of compressible filler 24,.placed one on each side of the extruded metal wall member/I9. The functions and purposes remain the same as before.

When load transmission from one slab to the next adjoining is desired, a dowel bar socket 28, is aillxed to the metallic wall member I9, and the dowel 29, cast integral with the slab is extended thru the stool and into the socket as shown. The socket 2B, in this case, serves the additional purpose of acting as a temporary reinforcing member to the stool--assisting the clips 25, and 21, in the preventing of the premature collapse or destruction of the joint during the pouring of the concrete.

After the concrete has had its initial set, the reinforcing members and the stool, as such, have served their purpose-as before stated-and their ultimate collapse and destruction effected by the expansion of the slabs does in no way affect the proper functioning of thev joint as a unit. The same statement holdsy true to the compressible wall of the stool, as this member likewise has served its purpose once the concrete has set. The clips 2 I, and 22, being of relatively smaller cross-y section, will shear and permit of the free unin# terrupted and independent movement of the anchors and the seal. The stool, as a unit, has no connection to and is not anchored, in any manner, to the ends of the adjoining concrete sections, therefore does not function with the adjoining sections of concrete.

We are aware that premoulded strips of fibre matrix impregnated with a bitumen have been employed as expansion joints prior to this application: that they have been used in combination with bulkhead construction and various forms of seals before this application: and that they are now used in combination with a me tallic stool. We do not, therefore, claim them as such, but what we do claim and desire to secure by Letters Patent, is-

l. In a device for forming a space between adjacent ends of concrete sections and sealing said space, the combination of a seal and a support therefore, the seal being formed of a piece 'of metal bent to form relatively movable side walls, the supportconsisting of a pair of walls Yplaced in juxtaposition, one of which walls is plastic and impressible and the other immobile and unyielding, said unyielding wall having recesses preformed therein which establish a plurality of cavities between the faces of the respective walls, and which cavities receive portions of said plastic wall when deformed under compression. 2. In a device for forming a space between adjacent ends of concrete sections and sealing said space, the combination of a seal and a support therefor, the seal being formed of a piece of metal bent to form relatively movable side walls, the support consisting of two walls placed in juxtaposition, one of`which walls is plastic and impressible andthe other immobile and unyielding, said unyielding wall having recesses preformed therein which establish a plurality of cavities at intervals between the faces of the respective walls, and which cavities receive portionsl of said plastic wall when under compression and the plastic wall deformed. said support Just de- .scribedbeingcappedbysaidseaL 3. In a device for forming a space between adjacent ends of concrete sections and sealing said space. the combinationof a pair of seals and a member connecting said seals, said member consisting of the combination of a relatively rigid recessed wall and a body comprised of a yieldable .mass of material placed adjacent to said wa'll adapted to be deformed into the recessed wall upon the movementl of said concrete sections towards one another.

4. In a device for forming a space between adjacent ends of concrete sections andsealing said space, the combination of a support and a seal capping an edge thereof, and means reinforcing said seal against premature collapse during the setting of the device and the pouring of the concrete, said means consisting of one edge of said support extending across the space between tl-ie walls of said seal and positioned withlin the seal between the upper and lower confines of said seal, and said support itself consisting of` a plastic and 'deformable wall associated with an unyieldable and immobile wall recessed to rereive deformed portions of said plastic wall upon movement of said concrete sections toward each other.

5. In a device for forming a space between adjacent ends of concrete sections and sealing said space, the combination of a support and a seal capping anedge thereof, said support consistingof a yieldable and deformable member associated with an immobile and unyielding member recessed to receive deformed portions of said deformable member upon the movement of the adjacent sections of concrete towards one an- A,

other, and means associated with said members adapted to. limity the relative vertical movement of the adjacent concrete sections.

6. In a device for forming and sealing a space between adjacent ends of concrete sections, the combination of a support for the seal, said support consisting of a'yieldable and deformable element associated with an unyielding and rigid element, said rigid element being 4recessed. to receive deformed portions of said yieldable element uponl the movement of said elements to- \ward each other, said support reinforcing the seal against premature collapse during the setting of the vvrdevice and the pouring of the concrete, and means associated with said support for preventing relative vertical movement between the adjacent concrete sections.

'plastic body.

7. A device for forming a space between adjacent yends of concrete sections and sealing said space, said device being comprised of a stool and a seal, the seal being formed of a piece of resilient material bent back upon itself to provide 5 spaced walls movable in relation to each other within said space and from said bend, each of said walls having an outwardly extending flange at the lower termination thereof providing means for Yforming a bondbetween said flanges and the material in which said flanges are adapted 'to be embedded, said stool consisting of two elements, one a body comprised of a yieldable mass Y of material, and the other a relatively non-yieldable plate recessed to receive portions of said yieldable body under compression, and a. screed supported by said seal. 1

8. In a device for forming a space between adjacent ends of concrete sections and sealing said space, the combination of a seal and a sup- 2o port therefore, the seal being formed of a piece of metal bent to form relatively movable side walls, said support consisting Aof a. relatively rigid wall having longitudinally extending corrugations and a. plastic body comprised of a yieldable and deformable mass of material placed adjacent to said corrugations and adapted to be deformed and when deformed to enter the corrugations in said wall, and said seal being capped by a like 30 9. In a device for forming a space between adjacent endsA of concrete sections and sealing isaid space, the combination of a seal and a support therefore, theseal being formed of apiece of metal bent to form relatively movable side walls, said support consisting of a pair of walls, one of which is plastic and .impressible and the other immobile and unyielding and having recesses therein adapted to receive portions of the plasticvwall upon the expansive movement of said 40 concrete sections, the Walls of said support being capped by said seal, one of said walls being formed at its opposite edges to respectively provide means connecting said seal to said wall and provide means preventing the premature separation of v said walls.

yERIC E. HALL.

WILLIAM H. EICHEIMAN. 

